Mitsubishi Electric PLH-2 User manual

Air-Conditioners
PLH-2, 2.5KKC
E
FOR INSTALLER
INSTALLATION MANUAL
For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.
ON/OFF –
STAND BY
DEFROST
CENTRALLY CONTROLLED
˚C
CLOCK
ON OFF ˚C
1Hr.
NOT AVAILABLE
CHECK MODE
FILTER
CHECK
TEST RUN

2
E1. Safety Precautions
1.1. Before installation and electric work
sSince this unit contains rotating parts and parts which
could cause an electric shock,be sure to read all of the
“Safety Precautions” before operating the unit.
sThe “Safety Precautions” provide very important points
regarding safety. Make sure you follow them.
sPlease report to or take consent by the supply author-
ity before connection to the system.
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger
of injury or death to the user.
Caution:
Describes precautions that should be observed to prevent damage
to the unit.
Symbols used in the illustrations
: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Indicates that caution should be taken with rotating parts. (This sym-
bol is displayed on the main unit label.) <Color: Yellow>
: Indicates the main switch. (This symbol is displayed on the main
unit label.) <Color: Blue>
Warning:
Carefully read the labels affixed to the main unit.
1.1. Before installation and electric work
This Installation Manual and the Operation Manual should be given to the
user of the air conditioner. The user should keep both manuals in a place
where they are accessible at any time. If the air conditioner must be moved
or repaired, these manuals should be made available to the service per-
sonnel. These manuals should be kept with the air conditioner at all times
and passed on to subsequent users.
Warning:
• The unit should not be installed by the user. Ask the dealer or an
authorized technician to install the unit. If the unit is installed im-
properly, water leakage, electric shock or fire may result.
• Use only accessories authorized by Mitsubishi Electric and ask
the dealer or an authorized technician to install them. If accesso-
ries are installed improperly, water leakage, electric shock or fire
may result.
• The Installation Manual details the suggested installation method.
Any structural alteration necessary for installation must comply
with local building code requirements.
• The user should never attempt to repair the unit or transfer it to
another site. If the unit is repaired improperly, water leakage, elec-
tric shock or fire may result. If the air conditioner must be re-
paired or moved, consult the dealer.
1. Safety Precautions ................................................................................... 2
2. Indoor unit installation location ................................................................. 7
3. Outdoor unit installation location .............................................................. 8
4. Installing the indoor unit .......................................................................... 11
5. Installing the outdoor unit ....................................................................... 15
6. Cooling pipe and drain pipe ................................................................... 16
7. Electrical work ........................................................................................ 20
8. Test run .................................................................................................. 28
9. Troubleshooting ..................................................................................... 30
10. Field electrical wiring (Power wiring specifications) ............................... 31
11. Installing the grille .................................................................................. 32
EContents

3
E
1.1. Before installation and electric work
Warning:
•The unit must be securely installed on a structure that can sus-
tain its weight. If the unit is mounted on an unstable structure, it
may fall down causing injuries.
•Use only specified cables for wiring. The connections must be
made securely without pulling on the terminals. Improper con-
nections or installation may generate heat or cause a fire.
•The unit should be installed according to the instructions in or-
der to minimize the risk of damage from earthquakes, typhoons
or strong winds. An improperly installed unit may fall down and
cause damage or injuries.
•When installing an optional air cleaner or humidifier, be sure to
use only products specified by Mitsubishi.
All accessories must be installed by an authorized technician.
The user must not try to install accessories. Improperly installed
accessories can cause water leakage, electric shock or fire.
•Do not turn on the power until installation has been completed.
Failure to do so may cause an electric shock or fire.
1. Safety Precautions
1.1. Before installation and electric work
Warning:
•All electric work must be performed by a licensed technician, ac-
cording to local regulations and the instructions given in this
manual.
The units should be powered by dedicated power lines. Power
lines with insufficient capacity or improper electrical work may
result in electric shock or fire.
•The terminal block cover of the outdoor unit must be firmly at-
tached to prevent entry of dust and moisture. Improper mounting
of the cover can cause electric shock or fire.
•Use only the specified refrigerant (R-22) to charge the refrigerant
circuit. Do not mix it with any other refrigerant and do not allow
air to remain in the circuit. Air enclosed in the circuit can cause
pressure peaks resulting in a rupture and other hazards.
•If the air conditioner is installed in a small room, measures must
be taken to prevent the refrigerant concentration in the room from
exceeding the safety limit in the event of refrigerant leakage.
Consult the dealer regarding the appropriate measures to pre-
vent the allowable concentration from being exceeded. Should
the refrigerant leak and cause the concentration limit to be ex-
ceeded, hazards due to lack of oxygen in the room could result.
•Ventilate the room if refrigerant leaks during operation.
If the refrigerant comes in contact with a flame, poisonous gases
will be released.

4
E
1.1. Before installation and electric work
Caution:
•Do not install the equipment where combustible gas may leak
and accumulate resulting in fire.
•Do not keep food, plants, caged pets, artwork or precision instru-
ments in the indoor unit’s direct airflow or too close to the unit,
as these items can be damaged by temperature changes or drip-
ping water.
•When the room humidity exceeds 80% or when the drain pipe is
clogged, water may drip from the indoor unit. Do not install the
indoor unit where such dripping could cause damage.
The outdoor unit produces condensation during the heating op-
eration. Make sure to provide drainage around the outdoor unit if
such condensation is likely to cause damage.
•This air conditioner should not be installed in areas exposed to
thick steam, volatile oil (including machine oil) or sulphuric smoke,
as this could significantly reduce its performance and damage
the internal parts.
1. Safety Precautions
1.1. Before installation and electric work
Fuse or breaker
AFuse or breaker
BMain power switch
CPower supply wiring
Disconnection must be incorporated in the fixed wiring.
Caution:
•When installing the power lines, do not apply tension to the ca-
bles, as this could loosen the connections, generate heat and
cause a fire.
•Use only a fuse of specified capacity. A fuse of larger capacity or
a steel or copper wire could cause a general unit failure or fire.
•Make sure to install an earth leakage breaker as this device helps
reduce the risk of electric shocks. Installation of an earth leakage
breaker is mandatory in some areas.
•For the power lines, use standard cables of sufficient current ca-
pacity. Otherwise, current leakage, overheating or fire may occur.
Earth connection
Caution:
Make sure to install a grounding line. Do not connect the grounding
line to gas or water pipes, lightning conductors or telephone ground-
ing lines. Improper grounding may cause an electric shock.
“WARNING-THIS APPLIANCE MUST BE EARTHED”
A
C
B

5
E
1.1. Before installation and electric work
Drain piping
Caution:
•Install drain piping according to this Installation Manual to en-
sure proper drainage. Place thermal insulation on the pipes to
prevent condensation. Improper drain piping may cause water
leakage and damage to furniture or other possessions.
•Thermal insulation of the drain pipes is necessary to prevent dew
condensation. If the drain pipes are not properly insulated, con-
densation will result and drip on the ceiling, floor or other pos-
sessions.
Miscellaneous
Caution:
Do not wash the air conditioner units. Washing them may cause an
electric shock.
1. Safety Precautions
1.1. Before installation and electric work
Caution:
•Be extremely careful when transporting the units. Two or more
persons are needed to handle the unit, as it weighs 20 kg or more.
Do not grasp the bands of the crate. Instead, insert your hands
into the cutouts in the crate. Wear protective gloves to extract the
unit from the crate and to move it, as you could injure your hands
on the fins or other parts.
•Transport the unit in its package and unpack it only on the instal-
lation site.
•The base and attachments of the outdoor unit should be periodi-
cally checked for looseness, cracks or other damage. If such de-
fects are left uncorrected, the unit may fall and cause personal
injury or property damage.
•Be sure to safely dispose of the packaging materials. Packaging
materials, such as catches and other metal or wooden parts, may
cause stabs or other injuries.

6
E1. Safety Precautions
1.2. Before starting the trial run
Caution:
•Before starting operation, check that all panels, guards and other
protective parts are correctly installed. Rotating, hot or high volt-
age parts can cause injuries.
•Do not touch the refrigerant pipes with bare hands during opera-
tion. The refrigerant pipes are sometimes hot and sometimes cold
depending on the condition of the flowing refrigerant. Your hands
may suffer burns or frostbite if you touch the pipes.
•Turn on the main power switch more than twelve hours before
starting operation. Starting operation just after turning the main
power switch on can result in severe damage to internal parts.
Keep the main power switch turned on during the operation sea-
son.
•Keep the outlets and inlets free of obstacles. Otherwise, the per-
formance may be reduced or operation may stop.
1.2. Before starting the trial run
Caution:
•Do not touch any switch with wet fingers, as this can cause an
electric shock.
•Do not operate the air conditioner without the air filter set in place.
Dust may accumulate, and cause a failure.
•After stopping operation, be sure to wait for five minutes before
turning off the main power switch. Otherwise, water leakage or
unit failure may occur.

7
E2.
Indoor unit installation location
2.1. Outline dimensions
(mm)
Models W D H
PLH-2, 2.5 760 760 307
•Mount the indoor unit on a wall strong enough to withstand the weight
of the unit.
•Select a location so that air can be blown into all corners of the room.
•Avoid locations exposed to outside air.
•Select a location free of obstructions to the airflow in and out of the
unit.
•Avoid locations exposed to steam or oil vapour.
•Avoid locations where combustible gas may leak, settle or be gener-
ated.
•Avoid installation near machines emitting high-frequency waves (high-
frequency welders, etc.)
•Avoid locations where the airflow is directed at a fire alarm sensor.
(Hot air could trigger the alarm during the heating operation.)
•Avoid places where acidic solutions are frequently handled.
•Avoid places where sulphur-based or other sprays are frequently used.
2.2. Service space
•Select ideal blowing direction according to the shape of room and in-
stalling position.
ACeiling
BCeiling panel
CObstacle
D1 m or more
E50 cm or more (Entire periphery)
FPanel
•Reserve the above mentioned space for doing the piping and wiring
work, as well as for the maintenance work which is done from the
bottom & left/right sides. Similarly, reserve as much space as possible
to facilitate work & safety at the time of suspending.
B
FCE
D
A
H30
DW

8
E2.
Indoor unit installation location
2.3. Refrigerant pipes
sCheck that the difference between the heights of the indoor and
outdoor units, the length of refrigerant pipe, and the number of
bends in the pipe are within the limits shown below.
Models (A) Pipe length (B) Height (C) Number of
(one way) difference bends (one way)
PLH-2 max. 40 m max. 40 m max. of 12
PLH-2.5 max. 50 m max. 50 m max. of 15
•Height difference limitations are binding regardless of which unit, in-
door or outdoor, is positioned higher.
ALength of refrigerant pipe
BHeight difference
CNumber of bends
DIndoor unit
EOutdoor unit
DA
B
C
E
3.1. Outline dimensions
(mm)
Models W D H A B C
PUH-2 870 295 650 500 185 330
PUH-2.5 870 295 850 500 185 330
•Avoid locations where combustible gas may leak, settle or be gener-
ated.
•Avoid locations exposed to direct sunlight or other sources of heat.
•If direct sunlight cannot be avoided, always install a sunshade to pro-
tect the outdoor unit from the sun.
•Select a location from which noise emitted by the unit will not incon-
venience neighbours.
•Bear in mind that during operation, drain water may flow from the unit.
•Avoid locations where the unit could be covered by snow.
In areas where heavy snow fall is anticipated, special precautions must
be taken to prevent the snow from blocking the air outlet or blowing
directly against it, as this would reduce the airflow and cause a mal-
function.
•Select a location permitting easy wiring and piping access to the power
source and indoor unit.
WD
H
A
B
C
E3.
Outdoor unit installation location

9
E3.
Outdoor unit installation location
3.2. Ventilation and service space
When installing a single outdoor unit
1Service space
Maintain an easily accessible service space in front of the unit as shown
in the diagram.
A10 mm or more
B500 mm or more
C500 mm or more
DService space
2Top obstacles
If there are no obstacles in front or at the left or right of the unit, obstacles
above the unit are permitted as shown in the diagram.
E100 mm or more
F500 mm or more
•The front, right and left sides must be free of obstacles.
3Unobstructed front (blowing side)
If the size of the space reserved for the unit is as shown in the diagram,
the unit can be installed so that obstacles are at the right, left and rear.
G10 mm or more
H200 mm or more
•The front and top must be unobstructed.
•The height of obstacles on either side must be the same or lower than
that of the outdoor unit.
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AB
C
D
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E
F
1
2
3
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H
G
G
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3.2. Ventilation and service space
4Obstacles in the front (blowing side) only
If there are obstacles in front of the unit, keep the back, left/right, & top
unobstructed.
IMin. 500 mm
5Obstacles at the front & rear only
The outdoor unit cannot be used except if the following conditions are
met:
An optional outdoor air outlet guide (left/right & top unobstructed) must be
fitted.
Moreover, if there is no natural wind flowing between the obstacles, keep
the height or width of the obstacles within the following range to prevent
the risk of short cycling. (If either the front or rear satisfies the require-
ments, there is no special restriction on the remaining side).
JObstruction width: 1.5 times the width of outdoor unit or smaller
KObstruction height: Unit height or lower
LAir outlet guide
MMin. 500 mm
NMin. 100 mm
6Obstacles on 4 surrounding sides
The unit cannot be used if there are obstacles on all 4 surrounding sides,
even if there is more than the prescribed amount of space around the
outdoor unit and if the top is unobstructed.
7Obstacles at the front & rear
This unit cannot be used if the following conditions are met:
PMax. 3000 mm
QMax. 100 mm
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M
N
J, K
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5
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P

10
E
3.2. Ventilation and service space
When installing many outdoor units
1Side-by-side arrangement
Remove the side screw on the pipe cover.
Keep the top unobstructed.
AMin. 100 mm
BMin.10 mm
CMin. 200 mm
DUp to 10 units (When the air outlet guides (sold separately) are used, no
more than five units should be arranged side by side.)
EMin. 1000 mm
•Refrigerant piping and electric wiring cannot be attached on the right
side.
2Face-to-face arrangement (with air outlet guide)
Fit an optional outdoor air outlet guide on each unit and set them to “up-
ward blow”.
FMin. 200 mm
GMin. 500 mm
3Face-to-face arrangement (without air outlet guides)
HMin. 200 mm
IMin. 1200 mm
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A
B
C
E
D
F
G
H
I
1
2
3
3.2. Ventilation and service space
4Parallel arrangement (with air outlet guides)
Fit an optional outdoor air outlet guide on each unit.
JMin. 1000 mm
5Parallel arrangement (without air outlet guides)
KMin. 3000 mm
4
5
J
K
3. Outdoor unit installation location

11
E
1
2
3
A
90°
B
B
3. Outdoor unit installation location
3.2. Ventilation and service space
Installation on a rooftop or other windy places
When installing the unit on a rooftop or other location unprotected from
the wind, situate the unit’s air outlet so that it is not directly exposed to
strong winds. Strong wind entering the air outlet may impede the normal
airflow and cause malfunctions.
The following shows three examples of precautions against strong winds.
1Face the outlet toward any available wall at least 50 cm away from
the wall.
2Install an optional air outlet guide and if the unit is installed at a
place where the powerful blast of a typhoon, etc. comes directly
into the air outlet.
AAir outlet guide
3Position the unit so that the air outlet blows perpendicularly to
the seasonal wind direction, if possible.
BWind direction
4. Installing the indoor unit
4.1. Check the indoor unit accessories
and parts
The indoor unit comes with the following parts and accessories.
1Installation template ×1
2Washers (with insulation) ×4
Washers (without insulation) ×4
3Pipe cover (for refrigerant piping joint)
small diameter ×1
large diameter ×1
4Band for temporary tightening of pipe cover
5Screw with the washers M5 ×25
for mounting grille ×4
6Drain hose ×1
7Remote controller ×1
8Insulation ×1
E
34
12
56
78

12
E4. Installing the indoor unit
4.2. Ceiling Openings and Suspension
Bolt Installation Locations
•Using the accompanying installation template and gauge, install the
main unit in such a way that the opening on ceiling falls at the place
shown in following diagram (usage method of template and gauge is
shown printed on them, respectively).
* Before using, check the dimensions of template and gauge, because
they change due to fluctuations of temperature and humidity.
* The dimensions of ceiling opening can be regulated within the range
shown in following diagram; so center the main unit against the open-
ing of ceiling, ensuring that the respective opposite sides on all sides
of the clearance between them becomes identical.
•Use M10 (3/8") suspension bolts.
* Suspension bolts are to be procured at the field.
•Install securely, ensuring that there is no clearance between the ceil-
ing panel & grille, and between the main unit & grille.
4.2. Ceiling Openings and Suspension
Bolt Installation Locations
•In case of installing the optional high efficiency filter element (filter case-
ment), the dimension between transom and ceiling shall be more than
440 mm.
<Installation of optional high efficiency filter element (filter casement)>
EOuter side of main unit
FSuspension bolt pitch
GCeiling opening
HOuter side of Grille
IGrille
JCeiling panel
* Note that the space between ceiling panel of the unit and ceiling slab and etc
must be 10 to 15 mm to be left.
117
114 117
117
68
690~710 25~3525~35
640
760
662
186 117
507
662 760
690~710
E
F
G
H
G
F
H E
200~215
250
135
54 +3
-2
J
I
54 +3
-2
65~80
115
30
253
J
I

13
E4. Installing the indoor unit
4.3. Suspension Structure (Give site of
suspension strong structure.)
•The ceiling work differs according to the construction of the building.
Buidling constructors and interior decorators should be consulted for
details.
(1) Extent of ceiling removal: The ceiling must be kept completely horizon-
tal and the ceiling foundation (framework: wooden slats and slat hold-
ers) must be reinforced in order to protect the ceiling from vibration.
(2) Cut and remove the ceiling foundation.
(3) Reinforce the ends of the ceiling foundation where it has been cut and
add ceiling foundation for securing the ends of the ceiling board.
(4) When installing the unit on a slanting ceiling, interlock a pillow be-
tween the ceiling and the grille and set so that the unit is installed
horizontally.
AUnit
BGrille
CPillow
4.3. Suspension Structure (Give site of
suspension strong structure.)
1Wooden structures
•Use tie beams (single storied houses) or second floor beams (two
story houses) as reinforcing members.
•Wooden beams for suspending air conditioners must be sturdy and
their sides must be at least 6 cm long if the beams are separated by
not more than 90 cm and their sides must be at least 9 cm long if the
beams are separated by as much as 180 cm. The size of the suspen-
sion bolts should be ø10 (3/8"). (The bolts do not come with the unit.)
DCeiling panel
ERafter
FBeam
GRoof beam
2Ferro-concrete structures
Secure the suspension bolts using the method shown, or use steel or
wooden hangers, etc. to install the suspension bolts.
HUse inserts rated at 100-150 kg each (procure locally)
ISuspension bolts M10 (3/8") (procure locally)
JSteel reinforcing rod
2
1
J
HI
A
B
C
DEFG
507
B*

14
E4. Installing the indoor unit
4.4. Unit Suspension Procedures
●Suspend the main unit as shown in the diagram.
Parts to be prepared at site.
•Suspension bolts (M10 or W3/8) ..................................................... 4
•Nuts (M10 or W3/8) ....................................................................... 12
Parts to be attached to the unit.
•Washers (with insulation) ................................................................. 4
•Washers (without insulation) ............................................................ 4
ASuspension bolt
BCeiling panel
CNut
DWasher (with insulation)
Cushion must be attached so that it faces down.
EMounting plate
FWasher (without insulation)
GNut (double)
HInstall at first and then tighten it.
IMin. 30 mm
JCheck using the installation gauge.
4.4. Unit Suspension Procedures
Figures given in parentheses represent the dimensions in case of install-
ing optional high efficiency filter element (filter casement).
1. In advance, set the parts onto the suspension bolts in the order of the
washers (with insulation), washers (without insulation) and nuts (dou-
ble).
* Fit the washer with cushion so that the insulation faces downward.
* In case of using upper washers to suspend the main unit, the lower
washers (with insulation) and nuts (double) are to be set later.
2. Lift the unit to the proper height of the suspension bolts to insert the
mounting plate between washers and then fasten it securely.
3. When the main unit can not be aligned against the mounting hole on
the ceiling, it is adjustable owing to a slot provided on the mounting
plate.
54
+3 -2
A
B
A
C
D
E
F
G
B
H
I
J

15
E4. Installing the indoor unit
C
D
B
A
4.5. Confirming the Position of Main Unit
and Tightening the Suspension Bolts
•Using the gauge attached to the grilles, ensure that the bottom of the
main unit is properly aligned against the opening on ceiling. Be sure to
confirm this, otherwise the dripping of condensation due to leakage of
wind and etc occur.
•Confirm that the main unit is horizontally levelled, using a level or a
vinyl tube filled with water.
•After ascertaining the position of main unit, securely tighten the nuts of
suspension bolts to fasten the main unit.
•Installation template attached to the crating materials can be used as
a protection sheet to prevent the dust from entering into the main unit
when the grilles are to be left without fitting to the unit for a while or in
case that the ceiling materials are to be lined after finishing the instal-
lation of the unit.
* As for the details of fitting, refer to the instructions given on the Instal-
lation template.
AMain unit
BCeiling panel
CInstallation template (attached to the crating materials)
D4-screw with the washers (Accessory)
Caution:
•It is best to transport the unit in its original packaging to the in-
stallation site.
•Since the centre of gravity of the unit is off-centre, caution is nec-
essary when lifting the unit using a rope, etc.
•The outdoor unit should not be tilted by more than 45°when trans-
porting. (Do not stock them sideways.)
1Prepare the concrete foundation
Always anchor outdoor unit legs by means of bolts. (Procure anchor bolts
locally.)
Secure firmly to prevent overturning by earthquakes or gusts of wind.
Keep the length of foundation bolts up to 25 mm from the bottom side
installation base.
AMake the embedding deep EInstallation base
BM10 (3/8") bolt FMax. 25
CFasten with bolt GLength of foundation bolts
DMake wide
2Bolt pitch for side-by-side arrangement of units:
H500 mm JMin. 10 mm
IMin. 380 mm K330 mm
J
K
HHI
2
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F
G
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B, C
D
A
1
5. Installing the outdoor unit
E

16
E6. Cooling pipe and drain pipe
Notes:
•Cooling pipes are available as an option. Read the manual before
beginning their installation.
•Place insulation materials over cooling pipes and drain pipes to
prevent condensation.
•If commercially available copper pipes are used, wrap liquid and
gas pipes with commercially available insulation materials (heat-
resistant to 100°C or more, thickness of 12 mm or more).
•The indoor parts of the drain pipe should be wrapped with
polyethylene foam insulation materials (specific gravity of 0.03,
thickness of 9 mm or more).
6.1. Refrigerant and drainage pipe sizes
Refrigerant and Drainage Piping Sizes
Item Model PLH-2, 2.5
Liquid ODø9.52 (3/8")
Gas ODø15.88 (5/8")
Drainage piping PVC pipe: VP-25 [ODø32 (1 1/4")]
Ordering numbers for separately sold refrigerant pipes
PLH-2, 2.5
5 m PAC-05FFS-E
7 m PAC-07FFS-E
10 m PAC-10FFS-E
15 m PAC-15FFS-E
6.2. Charging refrigerant
1Refrigerant amount
This product needs no additional charging of refrigerant for a pipe length
of 30 m or less. If the pipe length is longer than 30 m, add refrigerant
according to the table shown below.
•To add refrigerant, use the check valve connected to the low pressure
pipe inside the outdoor unit.
Models Allowable pipe
Amount of additional refrigerant (kg)
length (m) 31 –40 m 41 –50 m
PLH-2 40 0.2 —
PLH-2.5 40 0.2 0.5
2Air purge
Never air purge the refrigerant piping by releasing the refrigerant (gas)
contained in the outdoor unit. Always use a vacuum pump.
Warning:
Never use substances other than the specified refrigerant (R-22).
6.3. Refrigerant and Drainage Piping Lo-
cations
ADrain pipe (Connect to VP-25)
BCeiling panel
CGrille
DRefrigerant pipe (liquid)
ERefrigerant pipe (gas)
FDrain plug
GWater supply inlet (Drain lift-up mechanism)
HMain unit
IViewed from unit ceiling
•When the optional multi-functional casement is installed, add 135 mm
to all dimensions marked with ∗.
Refriger-
ant piping
∗243
∗166 ∗156
42
75 65
C
D
E
H
A
G
B
6
77 70
68
I
F

17
E6. Cooling pipe and drain pipe
6.4. Refrigerant piping
1) Indoor unit
•This unit has the flared connections on both indoor and outdoor sides.
1.1. When using separetely purchased refrigerant pipes:
a) Piping connection procedures
See that stop valve on outdoor unit is fully shut (unit is shipped with
valve shut). Remove caps from piping and unit and make flare con-
nection promptly (within five minutes). Repeat for each connection,
one at a time.
Removing caps and leaving piping open for extended periods of time
can permit penetration of damaging dust, moisture or foreign matter
into unit. In such cases, use refrigerant (R-22) to air purge piping
before making connections with unit.
b) Precautions concerning flexible tubing
•Use flexible tubing for indoor piping connections only.
•Avoid bending at angles more acute than 90°. Avoid repeated
bending of same tube more that three times.
•Locate bends as near as possible to center of piping lengths and
make bend with as large of a bending radius as possible.
6.4. Refrigerant piping
1.2. When using commercially available copper pipes:
See that stop valve on outdoor unit is fully shut (unit is shipped with
valve shut). After all piping connections between indoor and outdoor
unit have been completed, vaccuum-purge air from system through
the service port for the stop valve on the outdoor unit.
After completing procedures 1.1. or 1.2. above, open outdoor unit
stop valves stem fully. This completes connection of refrigerant cir-
cuit between indoor and outdoor units. Stop valve instructions are
marked on outdoor unit.
•Apply thin layer of refrigerant oil to pipe and joint seating surface
before tightening flare nut.
•Use two wrenches to tighten piping connections.
•Air-purge the refrigerant piping using your own refrigerant gas (don’t
air-purge the refrigerant charged in the outdoor unit).
•Use leak detector or soapy water to check for gas leaks after con-
nections are completed.
•Use refrigerant piping insulation provided to insulate indoor unit con-
nections. Insulate carefully following shown below.
6.4. Refrigerant piping
1.3. Heat insulation for refrigerant pipes
ARefrigerant pipe and insulating material (must be supplied locally)
BRemove the electric wiring service panel.
CPipe cover
DGas pipe
ELiquid pipe
FBand
GPress the pipe cover against the unit’s outer surface.
HCross-sectional view of connection
IRefrigerant pipe
JInsulating material for refrigerant pipe
KSqueeze
A
B
K
I
J
C
F
H
G
CC
F
DE
a

18
E6. Cooling pipe and drain pipe
6.4. Refrigerant piping
2) Outdoor unit
1Pipe take-in direction
The pipe can be passed in any of the four directions: front, rear, right and
lower side.
AFront piping (knockout)
BLower piping
CRight piping (knockout)
DBack piping
EPiping cover
2Remove the service panel (three screws) and the piping cover
(one screw).
FStop valve
GBending radius R 100 - 150 mm
HExtraction direction for service panel
JService panel
sBe careful not to break the bent portion when connecting the pipes. Be
sure to use two spanners to tighten the flare nuts.
3When racking the pipes, keep the racking below the top of the
piping cover to allow easy service panel removal.
IRacking
6.4. Refrigerant piping
3) Specified tightening torques (use a torque
wrench)
Torque specifications
Outer dia. of copper tube (mm) Tightening torque (kg/cm)
ø9.52 350 - 420
ø15.88 750 - 800
•If a torque wrench is not available, the following method may be used.
While tightening the flare nut with a spanner, stop turning the nut at the
point where the tightening torque suddenly increases. Then, turn the
spanner the angle specified in the table below.
Approximate additional tightening angle
Pipe diameter Tightening angle
ø6.35, ø9.52 60°–90°
ø15.88 30°–60°
I
E
1
2
3
A
B
C
D
E
H
F
E
J
G

19
E6. Cooling pipe and drain pipe
6.5. Drainage Piping Work
•Use VP25 (O. D. ø32 PVC TUBE) for drain piping and provide 1/100 or
more downward slope.
•Be sure to connect the piping joints using adhesive of polyvinyl chlo-
ride family.
•Observe the figure below for piping work.
•Use attached drain hose to change the pipe extraction direction.
AMax. 20m
Babout 1.5 to 2 m interval
CIndoor unit
DInsulation (9 mm or more)
EDownward slope (1/100 or more)
FSupport metal
GUse a support metal in the middle to prevent drain pipe movement.
HAir bleeder
IRaised
JOdor trap
Do not install air bleeder, raisers and odor traps.
6.5. Drainage Piping Work
Grouped piping
AVP (O. D. ø32 PVC TUBE)
BMake it as large as possible
CIndoor unit
DMake the piping size large for grouped piping.
EDownward slope (1/100 or more)
FVP30 (O. D. ø38 PVC TUBE) for grouped piping. (9 mm or more insulation)
For drain-up
GMax. 150 (as short as possible)
HDownhill gradient (1/100 or more)
IUp to 50 cm
JCeiling panel
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain pan (optional parts).
A
B
DE
F
G
C
H
I
J
E
C
ABA
E
F
D
A
C
CC
G
H
I
J
C

20
E6. Cooling pipe and drain pipe
6.5. Drainage Piping Work
1. Connect the flexible tube (supplied with the unit) to the drain port.
(Must not be bent more than 45 degrees.)
(Affix the tube using PVC adhesive then secure it with a band.)
2. Install a locally purchased drain pipe (PVC pipe, VP-25).
(Affix the pipe using PVC adhesive then secure it with a band.)
3. Insulate the tube and pipe. (PVC pipe, VP-25 and socket)
4. Check that drain flows smoothly.
5. Insulate the drain port with insulating material, then secure the mate-
rial with a band. (Both insulating material and band are supplied with
the unit.)
AUnit (Viewed from inside the room)
BInsulating material
CBand
DFlexible tube
EDrain port (transparent)
FInsertion margin
GMatching
HDrain pipe (VP-25)
IInsulating material (locally purchased)
JTransparent PVC pipe
KVP-25 (locally purchased)
(Slope 1/100 or more)
7. Electrical work
7.1. Precautions
sSupply power from independently branched circuit.
sWiring should conform to applicable standards.
sRoute wires connecting indoor and outdoor units and power sup-
ply wires separately so that they do not contact each other out-
side of the unit.
sThe primary side of the control circuit transformer is wired for
use with 240 V power supply. Wiring must be modified for use
with a 220 or 230 V power supply. Refer to the circuit diagram for
details.
sNever connect the power supply directly to the control wiring ter-
minals, as this will cause a unit failure.
sBe sure to wire together the control wiring terminals, otherwise
the unit will fail.
sThe compressor will not operate unless the power supply phase
connection is correct.
E
H
11
25 25 25
B
A
C
C
D
G
I
F
EF
J
K
C
D